Preliminary Information
64K
X46402
Dual Voltage CPU Supervisor with 64K Password Protected EEPROM
DESCRIPTION
The X464...
Preliminary Information
64K
X46402
Dual
Voltage CPU Supervisor with 64K Password Protected EEPROM
DESCRIPTION
The X46402 combines several functions into one device. The first is a dual
voltage CPU supervisor plus 64Kbit serial EEPROM memory with password protected write and read operations. The size of the password protected area is selectable by 3 control bits. A Write Protect (WP) pin in conjunction with a WPEN bit provides hardware OTP control of the configuration of the array. Password protected areas require 64 bit read or write passwords prior to access. The eighth illegal password entry (regardless of the number of correct entries) sets an OTP tamper bit. This bit is one of the 32 bits in the Device ID. A secondary
voltage monitor circuit activates a V2FAIL pin when the secondary supply
voltage drops below a V2trip
voltage. This circuit is primarily intended to detect the immediate loss of the battery supply. A low Vcc
voltage detect circuit activates a RESET pin when Vcc drops below a VTRIP
voltage. This signal also blocks read or write operations. A watchdog timer with the time period controlled by three bits provides several possible time out periods from 150ms to 1 minute.
FEATURES Dual
Voltage Detection and Reset Assertion —Low Vcc Monitor —Low V2MON Monitor —Low Vcc Block of EEPROM Writes —RESET Signal Valid down to Vcc=1V Selectable Watchdog Timer —150ms, 450ms, 1s, 5s, 10s, 20s, 1min, OFF Volatile Flag shows Watchdog/Low
Voltage Reset 64kbit 2-wire Ser...